Hi, is this a browser launched by your security software? Is it actually Firefox, or could it be a Chrome-based browser? If it's Firefox, it's possible that it doesn't use your normal profile, but instead a different profile. I'm not sure how to check on that.

The url I went to was www.MidWestOne.bank. I am not concerned with the font used by the website. I thought that changing the Firefox global font would affect the font in the protected browser.

I'm still not sure what you mean by protected browser. Firefox has regular windows and private windows, but it doesn't have a feature called a protected browser. Is this the ESET thing that uses a separate window with a green border?